diff options
| author | James Morse <james.morse@arm.com> | 2021-07-02 16:55:34 +0100 |
|---|---|---|
| committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2023-10-12 10:58:19 +0100 |
| commit | 57df2ac53eec8713bb408bc5ccd8c1e3c4ee7ae2 (patch) | |
| tree | 6123b535809d86a1a4566ce9d7929166015d16fa | |
| parent | 54da67d074df73f8438cc123a2359fddb59a6fa9 (diff) | |
ACPI: Warn when the present bit changes but the feature is not enabled
ACPI firmware can trigger the events to add and remove CPUs, but the
OS may not support this.
Print a warning when this happens.
This gives early warning on arm64 systems that don't support
CONFIG_ACPI_HOTPLUG_PRESENT_CPU, as making CPUs not present has
side effects for other parts of the system.
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
| -rw-r--r-- | drivers/acpi/acpi_processor.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index 29fe8ef02a98..1810438be188 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -188,8 +188,10 @@ static int acpi_processor_make_present(struct acpi_processor *pr) acpi_status status; int ret; - if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) + if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) { + pr_err_once("Changing CPU present bit is not supported\n"); return -ENODEV; + } if (invalid_phys_cpuid(pr->phys_id)) return -ENODEV; @@ -455,8 +457,10 @@ static void acpi_processor_make_not_present(struct acpi_device *device) { struct acpi_processor *pr; - if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) + if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) { + pr_err_once("Changing CPU present bit is not supported"); return; + } pr = acpi_driver_data(device); if (pr->id >= nr_cpu_ids) |